This workflow follows the Google Calendar → Google Sheets recipe pattern — see all workflows that pair these two integrations.
The workflow JSON
Copy or download the full n8n JSON below. Paste it into a new n8n workflow, add your credentials, activate. Full import guide →
{
"name": "Rodopi Dent - Patients Backfill from Calendar",
"nodes": [
{
"parameters": {},
"id": "manual-trigger",
"name": "Manual Trigger",
"type": "n8n-nodes-base.manualTrigger",
"typeVersion": 1,
"position": [
0,
0
]
},
{
"parameters": {
"jsCode": "// Date range: 1 year back to 3 months forward (to catch future appointments)\nconst now = new Date();\nconst oneYearAgo = new Date();\noneYearAgo.setFullYear(oneYearAgo.getFullYear() - 1);\nconst threeMonthsAhead = new Date();\nthreeMonthsAhead.setMonth(threeMonthsAhead.getMonth() + 3);\n\nreturn [{\n json: {\n startDate: oneYearAgo.toISOString().split('T')[0] + 'T00:00:00+02:00',\n endDate: threeMonthsAhead.toISOString().split('T')[0] + 'T23:59:59+02:00'\n }\n}];"
},
"id": "set-date-range",
"name": "Set Date Range",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
220,
0
]
},
{
"parameters": {
"operation": "getAll",
"calendar": {
"__rl": true,
"mode": "id",
"value": "rodopi.dent@gmail.com"
},
"returnAll": true,
"options": {
"timeMax": "={{ $json.endDate }}",
"timeMin": "={{ $json.startDate }}",
"singleEvents": true,
"orderBy": "startTime"
}
},
"id": "get-calendar-events",
"name": "Get All Calendar Events",
"type": "n8n-nodes-base.googleCalendar",
"typeVersion": 1.2,
"position": [
440,
0
],
"credentials": {
"googleCalendarOAuth2Api": {
"name": "<your credential>"
}
}
},
{
"parameters": {
"jsCode": "// Extract patient name + phone from all calendar events\nconst events = $input.all();\nconst patients = new Map(); // phoneKey -> { name, phone }\n\n// Normalize phone to +359 international format\nfunction toInternational(p) {\n let phone = String(p || '').replace(/[\\s()\\-.]/g, '');\n if (phone.startsWith('00359')) phone = '+359' + phone.slice(5);\n else if (phone.startsWith('0') && phone.length >= 10) phone = '+359' + phone.slice(1);\n else if (/^[89]\\d{8}$/.test(phone)) phone = '+359' + phone;\n else if (!phone.startsWith('+') && phone.length >= 9) phone = '+359' + phone;\n return phone;\n}\n\n// Extract core 9-digit number for deduplication\nfunction phoneKey(p) {\n return String(p || '').replace(/[\\s()\\-.+]/g, '').replace(/^359/, '').replace(/^0/, '');\n}\n\nfor (const item of events) {\n const event = item.json;\n const summary = (event.summary || '').trim();\n // Strip any HTML tags from description\n const description = (event.description || '').replace(/<[^>]*>/g, ' ');\n \n // Skip all-day events, events without title\n if (!summary || event.start?.date) continue;\n \n // Skip blocked/system events\n const lower = summary.toLowerCase();\n if (lower.includes('\u0431\u043b\u043e\u043a\u0438\u0440\u0430\u043d') || lower.includes('\u043f\u043e\u0447\u0438\u0432\u043a\u0430') || lower.includes('blocked') || lower.includes('block')) continue;\n \n // Extract phone from description - multiple patterns from most to least specific\n let phone = '';\n const phonePatterns = [\n /(?:\ud83d\udcde\\s*)?(?:\u0442\u0435\u043b|phone|tel)[.:\\s]+([+\\d\\s()\\-]{7,})/i,\n /(?:\ud83d\udcf1\\s*)([+\\d\\s()\\-]{7,})/,\n /((?:\\+359|00359)\\d{8,9})/,\n /(0[89]\\d{7,8})/,\n /\\b(\\d{9,10})\\b/\n ];\n \n for (const pattern of phonePatterns) {\n const match = description.match(pattern);\n if (match) {\n phone = match[1].replace(/[\\s()\\-]/g, '').trim();\n break;\n }\n }\n \n if (!phone || phone.length < 7) continue;\n \n // Store in international format\n const intlPhone = toInternational(phone);\n const key = phoneKey(phone);\n \n // Keep first occurrence of each patient\n if (!patients.has(key)) {\n patients.set(key, {\n name: summary,\n phone: intlPhone\n });\n }\n}\n\nconst patientList = Array.from(patients.values());\n\nreturn [{\n json: {\n extractedCount: patientList.length,\n totalEvents: events.length,\n patients: patientList\n }\n}];"
},
"id": "extract-patients",
"name": "Extract Patients from Events",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
660,
0
]
},
{
"parameters": {
"operation": "read",
"documentId": {
"__rl": true,
"mode": "id",
"value": "1hv4XAfHhScA40Bm1kQ3I-Ih4SJuCBpOJxTOYDNb167g"
},
"sheetName": {
"__rl": true,
"mode": "name",
"value": "Patients"
},
"options": {
"returnAllMatches": true
}
},
"id": "read-existing-patients",
"name": "Read Existing Patients",
"type": "n8n-nodes-base.googleSheets",
"typeVersion": 4.5,
"position": [
660,
200
],
"credentials": {
"googleSheetsOAuth2Api": {
"name": "<your credential>"
}
}
},
{
"parameters": {
"mode": "chooseBranch",
"output": "wait"
},
"id": "wait-for-both",
"name": "Wait for Both",
"type": "n8n-nodes-base.merge",
"typeVersion": 3,
"position": [
880,
100
]
},
{
"parameters": {
"jsCode": "// Compare extracted patients with existing and find new ones\nconst extracted = $('Extract Patients from Events').first().json;\nconst existingRows = $('Read Existing Patients').all().map(item => item.json);\n\n// Core 9-digit number for comparison\nfunction phoneKey(p) {\n return String(p || '').replace(/[\\s()\\-.+]/g, '').replace(/^359/, '').replace(/^0/, '');\n}\n\n// Build sets for lookup\nconst existingPhoneKeys = new Set();\nconst existingNames = new Set();\n\nexistingRows.forEach(p => {\n if (p.phone) existingPhoneKeys.add(phoneKey(p.phone));\n if (p.name) existingNames.add(p.name.toLowerCase().trim());\n});\n\n// Filter out already existing patients (by phone OR by name)\nconst newPatients = extracted.patients.filter(p => {\n const key = phoneKey(p.phone);\n const normName = p.name.toLowerCase().trim();\n return !existingPhoneKeys.has(key) && !existingNames.has(normName);\n});\n\nif (newPatients.length === 0) {\n return [{\n json: {\n noNewPatients: true,\n summary: `\u041e\u0431\u0449\u043e \u0441\u044a\u0431\u0438\u0442\u0438\u044f: ${extracted.totalEvents}, \u0418\u0437\u0432\u043b\u0435\u0447\u0435\u043d\u0438 \u043f\u0430\u0446\u0438\u0435\u043d\u0442\u0438: ${extracted.extractedCount}, \u0412\u0435\u0447\u0435 \u0432 \u0442\u0430\u0431\u043b\u0438\u0446\u0430\u0442\u0430: ${existingRows.length}, \u041d\u043e\u0432\u0438: 0`\n }\n }];\n}\n\nreturn newPatients.map(p => ({\n json: {\n noNewPatients: false,\n name: p.name,\n phone: p.phone,\n createdAt: new Date().toISOString().split('T')[0]\n }\n}));"
},
"id": "find-new-patients",
"name": "Find New Patients",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
1100,
100
]
},
{
"parameters": {
"conditions": {
"boolean": [
{
"value1": "={{ $json.noNewPatients }}",
"value2": true
}
]
}
},
"id": "has-new-patients",
"name": "Has New Patients?",
"type": "n8n-nodes-base.if",
"typeVersion": 2,
"position": [
1320,
100
]
},
{
"parameters": {
"operation": "append",
"documentId": {
"__rl": true,
"mode": "id",
"value": "1hv4XAfHhScA40Bm1kQ3I-Ih4SJuCBpOJxTOYDNb167g"
},
"sheetName": {
"__rl": true,
"mode": "name",
"value": "Patients"
},
"columns": {
"mappingMode": "defineBelow",
"value": {
"name": "={{ $json.name }}",
"phone": "={{ \"'\" + $json.phone }}",
"createdAt": "={{ $json.createdAt }}"
}
},
"options": {}
},
"id": "append-patients",
"name": "Append New Patients",
"type": "n8n-nodes-base.googleSheets",
"typeVersion": 4.5,
"position": [
1540,
200
],
"credentials": {
"googleSheetsOAuth2Api": {
"name": "<your credential>"
}
}
},
{
"parameters": {
"jsCode": "// Final summary\nconst items = $input.all();\nreturn [{\n json: {\n success: true,\n message: `\u2705 \u0414\u043e\u0431\u0430\u0432\u0435\u043d\u0438 ${items.length} \u043d\u043e\u0432\u0438 \u043f\u0430\u0446\u0438\u0435\u043d\u0442\u0438 \u0432 Patients sheet`,\n addedCount: items.length,\n patients: items.map(i => ({ name: i.json.name, phone: i.json.phone }))\n }\n}];"
},
"id": "summary",
"name": "Summary",
"type": "n8n-nodes-base.code",
"typeVersion": 2,
"position": [
1760,
200
]
}
],
"connections": {
"Manual Trigger": {
"main": [
[
{
"node": "Set Date Range",
"type": "main",
"index": 0
}
]
]
},
"Set Date Range": {
"main": [
[
{
"node": "Get All Calendar Events",
"type": "main",
"index": 0
},
{
"node": "Read Existing Patients",
"type": "main",
"index": 0
}
]
]
},
"Get All Calendar Events": {
"main": [
[
{
"node": "Extract Patients from Events",
"type": "main",
"index": 0
}
]
]
},
"Extract Patients from Events": {
"main": [
[
{
"node": "Wait for Both",
"type": "main",
"index": 0
}
]
]
},
"Read Existing Patients": {
"main": [
[
{
"node": "Wait for Both",
"type": "main",
"index": 1
}
]
]
},
"Wait for Both": {
"main": [
[
{
"node": "Find New Patients",
"type": "main",
"index": 0
}
]
]
},
"Find New Patients": {
"main": [
[
{
"node": "Has New Patients?",
"type": "main",
"index": 0
}
]
]
},
"Has New Patients?": {
"main": [
[],
[
{
"node": "Append New Patients",
"type": "main",
"index": 0
}
]
]
},
"Append New Patients": {
"main": [
[
{
"node": "Summary",
"type": "main",
"index": 0
}
]
]
}
},
"settings": {
"executionOrder": "v1"
},
"tags": [
{
"name": "Rodopi Dent"
}
]
}
Credentials you'll need
Each integration node will prompt for credentials when you import. We strip credential IDs before publishing — you'll add your own.
googleCalendarOAuth2ApigoogleSheetsOAuth2Api
Pro
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About this workflow
Rodopi Dent - Patients Backfill from Calendar. Uses googleCalendar, googleSheets. Event-driven trigger; 10 nodes.
Source: https://github.com/Georgi-Piskov/RODOPI-DENT/blob/07217e5d65fd897a41528db70a4869149ca9a5b1/n8n-workflows/23-patients-backfill.json — original creator credit. Request a take-down →
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